... ,OEM PROVIDED Specifications: 1)size: 48.3mm 2)Material: Drop forged steel 3)with T-bolt 4)nut sizes: 17mm, 19mm, 21mm ... scaffold: ringlock system, kwikstage system, cuplock system. 2) Scaffold couplers: drop forged, and steel pressed clamps.3) Frame scaffolding: plattec, mansion ...